We can convert virtually any video files to another media format that we want.

Qt FFmpeg dialog

FFmpeg converter

The picture is converting mp4 to webm using ffmpeg.

HTML5 Qt Video Player

The video recording below is the player built using HTML5 video tag with QWebView as its canvas. Internally, we have two containers: mp4 and ogv, and both are converted from recorded avi. The very converter of this tutorial was used for the conversion.